MS-Shared

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* The Automatic Protection Switch
...
"There are two types of SONET protection rings: multiplex section (MS) dedicated protection rings, and MS shared protection rings. An MS dedicated protection ring is constructed by two counter-rotating rings, transmitting in opposite directions. Only one direction carries normal traffic, while the other is reserved for protection of normal traffic. The dedicated protection ring APS protocol has not been standardized at the time of this writing. Shared protection rings, on the other hand, are realized in two ways: two- and four-fiber shared protection rings. Some of these rings are best known as UPSRs (two fiber) and BLSR/Xs (X = 2, two; and X = 4, four fibers). The reader is referred to [2] for a more comprehensive description of APS protocols in their various forms."

* The Automatic Protection Switch
...
"There are two types of SONET protection rings: multiplex section (MS) dedicated protection rings, and MS shared protection rings. An MS dedicated protection ring is constructed by two counter-rotating rings, transmitting in opposite directions. Only one direction carries normal traffic, while the other is reserved for protection of normal traffic. The dedicated protection ring APS protocol has not been standardized at the time of this writing. Shared protection rings, on the other hand, are realized in two ways: two- and four-fiber shared protection rings. Some of these rings are best known as UPSRs (two fiber) and BLSR/Xs (X = 2, two; and X = 4, four fibers). The reader is referred to [2] for a more comprehensive description of APS protocols in their various forms."